Definitions for "Thio"
A prefix that describes compounds in which a sulfur atom can be found where an oxygen atom is expected. The sulfate ion, for example, has the formula SO42-, whereas the thiosulfate ion has the formula S2O32-.
A prefix that means, "replace an oxygen with sulfur". For example, sulfate ion is SO42-; thiosulfate ion is S2O32-. Cyanate ion is OCN-; thiocyanate ion is SCN-.
Containing a sulfur atom.